It's Oenothera biennis
(Evening Primrose)
I think it is propagated by sewing the seeds.

It is evening primrose. Watch it carefully in the early evening as you will see each new flower gently unfolding over a couple of minutes. It is like watching time lapse photography.

No need to propagate. It will spread by itself from seed. In my garden I have to pull many of the new plants up each year to keep on top of it. I always keep a few though.

Thanks very much i will look forward to seeing where the seeds sow for next year! Will also get the deck chair and beer and spend time observing in the evening!